Projection type image display device
a projection device and image display technology, applied in the field of projection device, can solve the problems of complex structure, high cost, and difficult fine adjustment of the screen unit attached to the casing, and achieve the effects of simplifying a structure, fine adjustment, and improving operability
Active Publication Date: 2014-02-18
MITSUBISHI ELECTRIC CORP
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The solution improves operability by simplifying the structure, enabling fine adjustments and reducing assembly time, while preventing damage between neighboring units when arranged in rows and columns, thus enhancing maintenance efficiency and cost-effectiveness.
Problems solved by technology
Further, a large number of parts constituting the projection type image display device results in a complicated structure thereof.
So, assembly of the device requires much time and high cost.
Still further, it is hard to make fine adjustment in attaching the screen unit to the casing.
As a result, when a plurality of projection type image display devices are arranged (vertically and horizontally), neighboring screen units may be damaged by contacting with each other.
Method used
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[0020]A preferred embodiment of the present invention is described below with reference to drawings.
[0021]The technique introduced in Japanese Patent Application Laid-Open No. 2005-221834, based on which the present invention has been made, is described first.
[0022]FIG. 11 is a side sectional view of a projection type image display device in the background art. As shown in FIG. 11, a shaft 141, an oscillating lever 140 and others are provided to link a slide base 106 arranged on the left side surface of a casing, and a slide base (not shown) arranged on the right side surface of the casing, and to move the right and left slide bases in synchronization with each other. However, the degree of accuracy of synchronization is low due to the great length of the oscillating lever 140. Further, these parts may be required to be changed each time a screen or a casing is changed in size. Also, each time a screen unit 103 is changed in size or weight, other parts such as a damper for reducing ...
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A projection type image display device of the present invention includes: a screen unit with a screen onto which images are projected; a projection unit for projecting images onto the screen from the rear surface of the screen; right and left slide mechanisms as a pair for supporting the screen unit in a manner that allows the screen unit to move in a direction approximately normal to the screen; and a link shaft for linking the right and left slide mechanisms, and for moving the right and left mechanisms in synchronization with each other.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the invention[0002]The present invention relates to a projection type image display device, and more specifically relates to a projection type image display device for projecting images on a screen from its rear surface to display the images on the screen.[0003]2. Description of the Background Art[0004]Conventionally known projection type image display devices include a rear projection type image display device for projecting images from a projection unit onto a screen from its rear surface. In a commonly used rear projection type image display device, a screen unit with a screen is attached by screws and the like from the rear surface of a casing storing therein a projection unit and others to the front surface of the casing, in a manner that allows the screen unit to be detached from the casing. As a result of a trend toward reduced space for placing a projection type image display device in recent years, a newly developed projection ty...
Claims
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IPC IPC(8): H04N5/64G03B21/10G03B21/62H04N5/74
CPCG03B21/562
Inventor KITAGUCHI, AKIHIRO
Owner MITSUBISHI ELECTRIC CORP